72220749826 has 8 divisors (see below), whose sum is σ = 108333653004. Its totient is φ = 36109532160.

The previous prime is 72220749787. The next prime is 72220749863. The reversal of 72220749826 is 62894702227.

It can be written as a sum of positive squares in 2 ways, for example, as 62075224201 + 10145525625 = 249149^2 + 100725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72220749826.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308175 + ... + 489298.

Almost surely, 2^72220749826 is an apocalyptic number.

72220749826 is a deficient number, since it is larger than the sum of its proper divisors (36112903178).

72220749826 is a wasteful number, since it uses less digits than its factorization.

72220749826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842756.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 72220749826 in words is "seventy-two billion, two hundred twenty million, seven hundred forty-nine thousand, eight hundred twenty-six".